If set, use nb.metadata.authors for LaTeX author line

[mpetroff]

There's an authors metadata field that's part of the Notebook spec. If it's set, this pull request uses it to set the author line for LaTeX export.

[blink1073]

Thanks!

[ashwinvis]

@mpetroff How does this work? Can you share an example?

I tried to edit the notebook metadata towards the end of the file:

 "metadata": {
  "authors": ["Mr. A", "Mr. B"],
  "kernelspec": {
   "display_name": "Python 3",
   "language": "python",
   "name": "python3"
  },
  "language_info": {
   "codemirror_mode": {
    "name": "ipython",
    "version": 3
   },
   "file_extension": ".py",
   "mimetype": "text/x-python",
   "name": "python",
   "nbconvert_exporter": "python",
   "pygments_lexer": "ipython3",
   "version": "3.7.2"
  },
  "title": "Example"
 },

When I export as Latex, I only get this

    % Document parameters
    % Document title
    \title{Example}
    
    
    
    \author{, }

I wonder what is the need of the attribute='name' is in this line:

https://github.com/mpetroff/nbconvert/blob/80a1740cd2c31e20dbb6759e8b2cb778607e60f2/nbconvert/templates/latex/base.tplx#L157

[mpetroff]

Per the Notebook spec, the authors metadata is a list of dictionaries, not strings:

"metadata": {
  "authors": [
    {
      "name": "Fernando Perez"
    },
    {
      "name": "Brian Granger"
    }
  ]
}